rethink possible. >>> the port of oakland could soon be dealing with another strike. but this time it's concession workers at the airport threatening to walk off the job during one of the busiest times of year. ktvu's eric rasmussen to explain why the dispute center who are not part of the union. >> reporter: we're told that 1/3 of the service workers are nonunion. and at least half of them have said that they've been threatened or even fired for going to a union. and tonight they made that threat loud and clear. outside port of oakland headquarters. more than two dozen union members demanded what they called justice for about 100 nonunion coworkers at the airport who share their stories with board members upstairs. >> i don't get my break until 10 pháeups before i have to leave. >> without sick days, without over time pay, without breaks. >> reporter: arkeema says she was fired from subway at the oakland airport for complaining about conditions on the job. >> who's going to support me? i have to pay my rent. i have to pay my food. i dropped all my classes. >> report